Looks like chrome doesn't like the dd/mm/yyyy format, if I select a date with the day below 12 it works, chrome only fails if the day is above 12. not sure why that is a problem in chrome, but i suggest changing the date picker format to mm/dd/yyyy instead.

Can I use the WebAssist datepicker on this page considering that it's classic ASP?I have no idea how to change the format because it's an old datepicker from 2006 that I must have found on the web somewhere and I can't see any support for it. It's basically a .js file, which I attach should you be able to spot how I change the format.